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159 lines
4.2 KiB
159 lines
4.2 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2009-2011 Mateusz Loskot, London, UK. |
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library |
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. |
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// Use, modification and distribution is subject to the Boost Software License, |
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_GEOMETRY_ALGORITHMS_CLEAR_HPP |
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#define BOOST_GEOMETRY_ALGORITHMS_CLEAR_HPP |
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#include <boost/mpl/assert.hpp> |
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#include <boost/type_traits/remove_const.hpp> |
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#include <boost/geometry/core/access.hpp> |
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#include <boost/geometry/core/exterior_ring.hpp> |
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#include <boost/geometry/core/interior_rings.hpp> |
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#include <boost/geometry/core/mutable_range.hpp> |
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#include <boost/geometry/core/tag_cast.hpp> |
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#include <boost/geometry/geometries/concepts/check.hpp> |
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namespace boost { namespace geometry |
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{ |
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#ifndef DOXYGEN_NO_DETAIL |
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namespace detail { namespace clear |
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{ |
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template <typename Geometry> |
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struct collection_clear |
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{ |
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static inline void apply(Geometry& geometry) |
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{ |
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traits::clear<Geometry>::apply(geometry); |
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} |
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}; |
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template <typename Polygon> |
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struct polygon_clear |
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{ |
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static inline void apply(Polygon& polygon) |
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{ |
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traits::clear |
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< |
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typename boost::remove_reference |
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< |
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typename traits::interior_mutable_type<Polygon>::type |
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>::type |
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>::apply(interior_rings(polygon)); |
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traits::clear |
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< |
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typename boost::remove_reference |
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< |
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typename traits::ring_mutable_type<Polygon>::type |
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>::type |
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>::apply(exterior_ring(polygon)); |
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} |
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}; |
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template <typename Geometry> |
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struct no_action |
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{ |
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static inline void apply(Geometry& ) |
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{ |
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} |
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}; |
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}} // namespace detail::clear |
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#endif // DOXYGEN_NO_DETAIL |
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#ifndef DOXYGEN_NO_DISPATCH |
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namespace dispatch |
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{ |
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template <typename Tag, typename Geometry> |
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struct clear |
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{ |
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BOOST_MPL_ASSERT_MSG |
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( |
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false, NOT_OR_NOT_YET_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE |
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, (types<Geometry>) |
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); |
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}; |
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// Point/box/segment do not have clear. So specialize to do nothing. |
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template <typename Geometry> |
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struct clear<point_tag, Geometry> |
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: detail::clear::no_action<Geometry> |
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{}; |
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template <typename Geometry> |
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struct clear<box_tag, Geometry> |
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: detail::clear::no_action<Geometry> |
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{}; |
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template <typename Geometry> |
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struct clear<segment_tag, Geometry> |
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: detail::clear::no_action<Geometry> |
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{}; |
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template <typename Geometry> |
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struct clear<linestring_tag, Geometry> |
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: detail::clear::collection_clear<Geometry> |
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{}; |
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template <typename Geometry> |
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struct clear<ring_tag, Geometry> |
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: detail::clear::collection_clear<Geometry> |
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{}; |
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// Polygon can (indirectly) use std for clear |
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template <typename Polygon> |
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struct clear<polygon_tag, Polygon> |
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: detail::clear::polygon_clear<Polygon> |
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{}; |
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} // namespace dispatch |
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#endif // DOXYGEN_NO_DISPATCH |
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/*! |
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\brief Clears a linestring, ring or polygon (exterior+interiors) or multi* |
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\details Generic function to clear a geometry. All points will be removed from the collection or collections |
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making up the geometry. In most cases this is equivalent to the .clear() method of a std::vector<...>. In |
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the case of a polygon, this clear functionality is automatically called for the exterior ring, and for the |
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interior ring collection. In the case of a point, boxes and segments, nothing will happen. |
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\ingroup clear |
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\tparam Geometry \tparam_geometry |
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\param geometry \param_geometry which will be cleared |
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\note points and boxes cannot be cleared, instead they can be set to zero by "assign_zero" |
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\qbk{[include reference/algorithms/clear.qbk]} |
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*/ |
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template <typename Geometry> |
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inline void clear(Geometry& geometry) |
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{ |
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concept::check<Geometry>(); |
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dispatch::clear |
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< |
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typename tag_cast<typename tag<Geometry>::type, multi_tag>::type, |
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Geometry |
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>::apply(geometry); |
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} |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_ALGORITHMS_CLEAR_HPP
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